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Finding the Fourth Proportional to 674.08, 1,015.94 and 636.40

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Solution

The fourth proportional to 674.08, 1,015.94 and 636.40 is: 959.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.08 : 1,015.94 = 636.40 : x
  2. Step 2: Convert to fraction form
    674.08/1,015.94 = 636.40/x
  3. Step 3: Cross multiply
    674.08x = 1,015.94 × 636.40
  4. Step 4: Simplify right side
    674.08x = 646,543.27
  5. Step 5: Solve for x
    x = 646,543.27/674.08
  6. Step 6: Final answer
    x = 959.15

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.